Loyalty

adjective continuing without change; enduring; steadfast

• She was known for her abiding commitment to the principles of justice and equality.
• I have an abiding love for chocolate chip cookies.
• My friend's abiding crush on that celebrity is getting out of hand.
• The abiding sense of loss he felt after his grandfather passed away never truly went away.

noun excessive zeal or enthusiasm, especially for a particular cause or belief

• The rise of religious fanaticism has led to increased tensions in the region.
• His fanaticism for the local sports team knows no bounds.
• She's a total fanatic for that new band that just came out.
• The politician's fanaticism for power blinded him to the needs of the people.